Flapping and Bending Bodies Interacting with Fluid Flows

Shelley, Michael; Zhang, Jun

doi:10.1146/annurev-fluid-121108-145456

Cited by 353 publications

(248 citation statements)

References 73 publications

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“…As a side remark in his famous paper on the stability of jets, he showed that an infinite membrane placed in an airflow is always unstable. Of course, the problem becomes more complex when bending rigidity and finite plate dimensions are taken into account (see Païdoussis 2004;Shelley & Zhang 2011, for recent reviews)…”

Section: Introductionmentioning

confidence: 99%

The origin of hysteresis in the flag instability

2011

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The flapping flag instability occurs when a flexible cantilevered plate is immersed in a uniform airflow. To this day, the nonlinear aspects of this aeroelastic instability are largely unknown. In particular, experiments in the literature all report a large hysteresis loop, while the bifurcation in numerical simulations is either supercritical or subcritical with a small hysteresis loop. In this paper, this discrepancy is addressed. First weakly nonlinear stability analyses are conducted in the slender-body and two-dimensional limits, and second new experiments are performed with flat and curved plates. The discrepancy is attributed to inevitable planeity defects of the plates in the experiments.

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Section: Introductionmentioning

confidence: 99%

The origin of hysteresis in the flag instability

2011

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“…Meanwhile, there has been considerable research on the basic dynamics of flexible structures like flags, which can be bent, folded, twisted or waved in the air [19][20][21][22][23][24][25][26] . The first experimental study on fluttering behaviour was performed by Taneda 27 with a flag made of various fabrics and shapes, to find a variety of flapping modes (for example, nodeless, one-node, imperfect-node and two-node flutters).…”

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confidence: 99%

Flutter-driven triboelectrification for harvesting wind energy

et al. 2014

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Technologies to harvest electrical energy from wind have vast potentials because wind is one of the cleanest and most sustainable energy sources that nature provides. Here we propose a flutter-driven triboelectric generator that uses contact electrification caused by the selfsustained oscillation of flags. We study the coupled interaction between a fluttering flexible flag and a rigid plate. In doing so, we find three distinct contact modes: single, double and chaotic. The flutter-driven triboelectric generator having small dimensions of 7.5 Â 5 cm at wind speed of 15 ms À 1 exhibits high-electrical performances: an instantaneous output voltage of 200 V and a current of 60 mA with a high frequency of 158 Hz, giving an average power density of approximately 0.86 mW. The flutter-driven triboelectric generation is a promising technology to drive electric devices in the outdoor environments in a sustainable manner.

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“…Here, we use the average speed of the filament's trailing edge U˜ as a scale of the filament's velocity. The kinematic energy integral approximates on a scale of (6) Taking the filament length L as a reference length and considering a soap film with a width L passes the filament, the fluid kinematic energy is expressed as (7) where is the density of the soap film and d is the thickness of the soap film. The value of d depends on the soap film flow velocity.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

“…(4), (6), and (7), we get (8) where S = ml/ dL. S is the dimensionless density which is a control parameter in the instability of a flag's flapping.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

“…4,5 Due to its theoretical and practical significance, the flapping of a plate in fluid flow has been investigated extensively both theoretically and experimentally. 6 The most simplified and classical model for this problem is a flexible flag in a steady fluid stream. Experimental studies on the flapping behavior of a flag have been conducted in soap films, water tunnels, and low-speed wind tunnels.…”

Section: Introductionmentioning

confidence: 99%

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Response of a flexible filament in a flowing soap film subject to a forced vibration

Jia

Xiao

et al. 2015

Physics of Fluids

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This version is available at https://strathprints.strath.ac.uk/54811/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Response of a flexible filament in a flowing soap film subject to a forced vibration The interactions between flexible plates and fluids are important physical phenomena. A flag in wind is one of the most simplified and classical models for studying the problem. In this paper, we investigated the response of a flag in flow with an externally forced vibration by using flexible filaments and soap film. Experiments show that for a filament that is either in oscillation or stationary, the external forced vibration leads to its oscillation. A synchronization phenomenon occurs in the experiments. A small perturbation leads to a large response of flapping amplitude in response. The insight provided here is helpful to the applications in the flow control, energy harvesting, and bionic propulsion areas. C 2015 AIP Publishing LLC.

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Flapping and Bending Bodies Interacting with Fluid Flows

Cited by 353 publications

References 73 publications

The origin of hysteresis in the flag instability

The origin of hysteresis in the flag instability

Flutter-driven triboelectrification for harvesting wind energy

Response of a flexible filament in a flowing soap film subject to a forced vibration

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